.big{
    width: 1000px;
    margin: 0 auto;
}
.big >img{
    width: 100%;
    display: block
}
.big table{
    width: 100%;
    text-align: center
}
.big>a{
    display: block;
    margin: 10px 0;
    width: 100px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    border-radius: 5px;
    background: blue;
    color: #fff;
    text-decoration: none;
}